I have a 98 civic with the complete b18b1 ls swap with turbo. I'm rebuilding the bottom end including crank, Pistons and rods. Where can I get the best parts for the cheapest for all parts not just those?
Talk to whomever you're having build the engine. The machine shop may have decent deals on parts. Some shops will not warranty a motor unless they order the parts either. So it's a good idea to check in to it.
His crank may be damaged from a spun rod. (Might explain why he's rebuilding the bottom end.)
Personally if i'm replacing parts I prefer to upgrade them.